M_E_C

I have been running the s300s4 ezk chip in my 89 s4 for a while now and it has been running well. I also the 24# injectors lying around for a long time and finally got up the nerve to swap the injectors and LH chip. the actual install went quicker than expected and I looked forward starting it up. I expected it to be a bit rough at first but it barely ran. It felt like it was just running on few cylinders. Would only run with the throttle open and was really rough and spewed a lot of smoke. It would get up to about 2000 rpm then die.


There was a lot of water coming out of the exhaust. I don't have any diagnostic tools so what can I do to troubleshoot this.


Thanks

jwyatt8171

Sounds like too much fuel, flooding. Mine was similar when I first started with 42 lb before tuning with sharktuner. Did the injectors get tested before install? Are they new?

M_E_C

They were new from Roger about a year ago and I just never installed them. I didn't test them as I expected since they were new that I wouldn't need to.

PorKen

Did you install the coding plug bypass (unplug the coding plug at least)?


Could be a bad chip. There seems to be more problems with chips shipped internationally.

M_E_C

No. I just installed the LH.

M_E_C

What do I do with the coding plug bypass. Do you think it would help?

PorKen

89-up the coding plug shorts the CO adjuster so you need to disconnect the coding plug. The included (empty) plug is a reminder to not plug it back in.

Did you receive a CO adjuster? If yes, you can plug it in and adjust the fueling somewhat. As delivered, 382 ohms is the center, CCW leans/less ohms, CW richens/more ohms, range is 0-1000.

M_E_C

Ok. I admit to being a total Newby when it comes to this. Where do I find the coding plug to disconnect it. is this the co adjuster?

PorKen

The coding plug is attached to the bracket which holds the LH and EZ. Do you have the empty plug?

That is the CO pot, yes. It plugs into an empty socket usually tucked under the computers.

Speedtoys

Is this to 'tune' into a fresh looking MAF?

PorKen

MAF variances, yes. New MAFs can be on the rich side.

Mainly it's to adjust for altitude or injector differences so that cold starting is better.

I would like to make a WOT adjuster too (and possibly other functions) using the coding plug. Maybe this winter.

safulop

I don't know if this has happened to others but, when I installed the Porken chips full combo with injectors, I got the same outcome (running super-rich, basically flooded) and then my MAF died. Still don't know if this was coincidence or what but I now have a new MAF and am back to stock injectors and LH. My shop was not willing to play with the adjustment so, maybe I could have had success if they were more willing to experiment.

M_E_C

Ok. I will disconnect the coding plug and instal the CO adjuster when I get home from work. I'll give that a shot. If that doesn't resolve it, can I put the stock LH chip back but leave the 24# injectors (assuming they are all good). How would the car run? Could I use that as a way to determine if it's a bad LH chip or not?

safulop

Well I am no mechanic but I do not believe that the 24# injectors can be used with stock chip. The chip is calibrated for the type of injector and they cannot be mismatched or all hell will break loose when the LH chip thinks it has 19# injectors to work with.

safulop

Ah so, turns out this is actually possible? When my shop blamed the chip last year, they were subjected to the usual round of vilification by the forum trolls and self-styled professionals hereabout. They had "put the chips in backwards," or perhaps "bumped the temp sensor", it "was not a chips problem" we were all told.